This is happening to me too! I get the grey exclamation mark when I tried to upload my posts and pages to Lingotek.
In addition, one of my sites doesn’t seemed to be connected to my Lingotek account anymore. When I went to Translation > Dashboard > Connect to my existing Lingotek account, it brought me to an empty page. It had been this way since last Wednesday and I haven’t changed any settings whatsoever. Merely updated the plugins. Have emailed the Lingotek support team too. Really hope to hear from them soon as I really love this plugin.